A:had wor
B:are wearing
C:were having o
D:were dressing
图3为我国某区域分层设色地形图。回答
对图示区域的总体地势特点,描述正确的是( )
计算:
① 12 +(+3)=____;②(-3)+2=____;③( -32 )+( -12 )=____;④(-5)+ -9 =____ .